Motion picture film for three dimensional projection

Abstract

Stereo pairs which have printed on a single film strip are directed and focused upon a screen by an attachment for a standard motion picture projector. The images are overlapped and polarized at right angles to the other upon the screen by an optical device having abutting elements. The stereo pairs on the film are separated by an opaque band to define the edges of the projected image and mask element abutment. Indicia marks are provided on the film to enable the positioning of the right and left images on the film in the gate to avoid pseudo stereo projection. A film format for stereo pairs uses a dark bar centered at the aperture on the film or gate.

Having thus fully described the invention what is claimed and sought to be protected by U.S. Letters Patent is: 
     
       1. In a motion picture projection system for the projection of 3-dimensional pictures, a motion picture projector adapted therefor, a gate in said motion picture projector, a single strip motion picture film positioned in said projector, said motion picture film comprising a succession of frames, a right stereo image and a left stereo image positioned within each said frame, a dark bar strip between said right and said left images positioned at the center of said frame, and an indicium mark on said film to predetermine the location of the said right and left images in said gate, a projected image including an image of said indicium at an edge thereof, a reflecting mask at an edge of the projected image, the said mask blocking and displaying said indicium only, the reflected image of said indicium on said mask being an indicator that the projected image is in true stereo. 
     
     
       2. A motion picture projection system for the projection of 3-dimensional pictures according to claim 1, in which there are two indicium marks, a first indicium mark relating to said right image and a second indicium mark relating to said left image, said first and second indicium markings being optically distinguishable from each other.